Lots of causes are there why you need to find your own locksmith of choice rather than letting your contractor pick one of you. Right now, you are building your house, and then chances are your contractor has selected a door and window installer that just could be part of the regular construction crew. There is no problem in this setup but it will be much better if you find security specialist that you can establish a relationship with trust in case you need to upgrade your doors, windows and other locked entrances and exists.
There is also some of the chance that any emergency can arises and you may require their expertise. There are many good service providers in your area. So you just need to search on your cell phone and type locksmith near me on phone and you will able to see a good quality of locksmiths in your area.